package com.lagou.web.servlet;

import com.lagou.base.Constants;
import com.lagou.pojo.Course;
import com.lagou.service.impl.CourseService;
import com.lagou.service.impl.CourseServiceImpl;
import com.lagou.utils.DateUtils;
import com.lagou.utils.UUIDUtils;
import org.apache.commons.beanutils.BeanUtils;
import org.apache.commons.fileupload.FileItem;
import org.apache.commons.fileupload.FileUploadException;
import org.apache.commons.fileupload.disk.DiskFileItemFactory;
import org.apache.commons.fileupload.servlet.ServletFileUpload;
import org.apache.commons.io.IOUtils;

import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

/**
 * 专门用来保存和修改课程信息
 * 不在继承BaseServlet 因为获取不到参数
 */

@WebServlet("/courseSalesInfo")
public class CourseSalesInfoServlet extends HttpServlet {

    /**
     * 保存课程营销信息
     *          收集表单数据，封装到course对象中，将图片上传到tomcat服务器中
     * @param req
     * @param resp
     * @throws ServletException
     * @throws IOException
     */
    @Override
    protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        try {
            //1.创建course对象  一会需要用BeanUtils向course对象中封装数据
            Course course = new Course();
            //2.创建map集合  他的作用是用来收集数据
            Map<String,Object> map = new HashMap<>();
            //3.创建磁盘工厂对象
            DiskFileItemFactory factory = new DiskFileItemFactory();
            //4.文件上传核心对象
            ServletFileUpload fileUpload = new ServletFileUpload(factory);
            //5.解析request对象，获取表单项集合
            List<FileItem> list = fileUpload.parseRequest(req);
            //6.遍历集合 判断哪些是普通的表单项，哪些是文件表单项
            for (FileItem item : list) {
                boolean formField = item.isFormField();
                if (formField){
                    //是普通表单项 获取表单项中的数据 保存到map
                    String fieldName = item.getFieldName();
                    String value = item.getString("utf-8");
                    System.out.println(fieldName + "_" + value);
                    //使用map收集数据
                    map.put(fieldName,value);
                }else {
                    //文件上传项
                    //获取文件名
                    String fileName = item.getName();
                    String newFileName = UUIDUtils.getUUID()+"_" +fileName;
                    //获取输入流
                    InputStream in = item.getInputStream();
                    //获取webapps的目录路径
                    String realPath = this.getServletContext().getRealPath("/");
                    String webappsPath = realPath.substring(0, realPath.indexOf("lagou_edu_home"));
                    //创建输出流
                    OutputStream out = new FileOutputStream(webappsPath+"/upload/"+newFileName);
                    IOUtils.copy(in,out);
                    //关闭流
                    out.close();
                    in.close();

                    //将图片路径进行保存
                    map.put("course_img_url", Constants.LOCAL_URL+"/upload/" + newFileName);
                }
            }

            //使用BeanUtils将mao中的数据封装到course对象
            BeanUtils.populate(course,map);

            String dateFormart = DateUtils.getDateFormart();
            CourseService cs = new CourseServiceImpl();
            if (map.get("id") != null){
                //修改操作
                //补全信息
                course.setUpdate_time(dateFormart); //修改时间
                String result = cs.updateCourseSalesInfo(course);
                //响应结果
                resp.getWriter().print(result);

            }else {
                //新建操作
                //补全信息
                course.setCreate_time(dateFormart);
                course.setUpdate_time(dateFormart);
                course.setStatus(1); //上架
                //业务处理
                String result = cs.saveCourseSalesInfo(course);
                //响应结果
                resp.getWriter().print(result);
            }

        } catch (Exception e) {
            e.printStackTrace();
        }
    }

    @Override
    protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        doGet(req, resp);
    }
}
